The Isothermal Section Of The Co-Pr-Sb Ternary System At 500℃ And The Crystal Structure Of New Ternary Compounds

Phase equilibria in the Co-Pr-Sb ternary system at 500°C have been studied mainly by means of X-ray powder diffraction (powder XRD), with the aid of differential thermal analysis (DTA), scanning electron microscopy (SEM) with energy dispersive analysis. The existence of 16 binary compounds and one ternary compound was confirmed: Co₁₇Pr₂, Co₅Pr, Co₇Pr₂, Co₃Pr, Co₂Pr, Co₃Pr₄, Co₂Pr₅, CoPr₃, Pr₂Sb, Pr₅Sb₃, Pr₄Sb₃, PrSb, PrSb₂, CoSb, CoSb₂, CoSb₃ and CoPrSb₂; The compound Co₁₉Pr₅ was not observed in binary or ternary alloys at 500°C. This isothermal section consists of 22 single-phase regions, 44 two-phase regions and 23 three-phase regions.22 single-phase regions are: α(Co), β(Co₁₇Pr₂), γ(Co₅Pr), δ(Co₇Pr₂), ε(Co₃Pr), ζ(Co₂Pr), η(Co₃Pr₄), θ(Co₂Pr₅), ι(CoPr₃), κ(Pr), λ(Pr₂Sb), μ(Pr₅Sb₃), Ï…(Pr₄Sb₃), Ï€(PrSb), ρ(PrSb₂), σ(Sb), Ï„(CoSb₃), Ï…(CoSb₂), ω(CoSb), φ(CoPrSb₂), χ(CoPrSb₃), ψ(CoPr₅Sb₂).44 two-phase regions are: α+β, β+γ, γ+δ, δ+ε, ε+ζ,ζ+η, η+θ, θ+ι,ι+κ, κ+λ, λ+μ, μ+Ï…, Ï…+Ï€, Ï€+ρ ,ρ+σ, σ+Ï„, Ï„+Ï… , Ï…+ω, ω+α, Ï„+ρ, Ï„+χ,ρ+χ, χ+φ, Ï„+φ φ+ρ, Ï…+φ, ω+φ, Ï€+φ, φ+α, α+Ï€, β+Ï€, γ+Ï€, γ+Ï…, δ+Ï…, ε+Ï…, ε+μ, ζ+μ, ψ+μ, ζ+ψ, η+ψ, θ+ψ, ι+ψ, β+ψ, ψ+λ.